Graver-sharpening and facet-cutting machine



July 3, 1928. f 1,675,981

" J. W. LEES GRAVER SHARPENING AND FACETf CUTTING MACHINE Filed Aug. 9, 192e 2 sheets-Sheet 1 y r 4 I L .I

M 2220 f8 Z2 28 0 ugj 6 E46 /rfwlee July 3, 1928.

1,675,981 J. w. LEI-:s

GRAVER SHARPENING AND FACET CUTTING MACHINE File@ Auge, 192e 2 sheets-shes*b 2 lll Patented July 3, 1928.

JGHN W. LEES, 0F LOS ANGELES, CALIFORNIA.

enAvnn-snnnrmvrue AND moar-CUTTING MACHINE.

Application led August 9, 1926. Serial No. 128,123.

This-invention relates to improvements in abrading devices and particularly to that class of abrading devices which are designed for shaping and sharpening gravers and the like and also to devices used by stone cutters in forming facets upon precious stones.

An object of this invention is to provide an improved abrading device having an abrasive element and a work-holder, the work-holder being so constructed that a graver can be mounted thereon so that one of its sides will have a predetermined inclination with respect to the abrasive element, and upon turning the graver over upon its opposite side the opposite side will assume the same inclination with respect to the abrasive element, thus enabling the graver to be equally ground or sharpened upon both sides. In this Away it is possible to have the cutting edge on the graver extend perfectly along the center line or longitudinal axis of the graver which is quite essential in many instances where ine engraving is being done.

Another object of thisinvention is yto provide a device wherein a work-holder has a plurality of parallel ytransverse ridges or projections which are spaced from each other at different distances so that any two of these ridges or projections can be selected between which a graver or other article may be positioned so that the adjustment of the inclination of the side of the graver or other article with respect to the abrasive element can be varied.

A. further object. ofthis invention is to provide a work-holder of novel construction which will enable articles to be ground to be\ easily mounted thereon or removed therefrom.

A still further object of this invention is to provide an abrading device having an abrasive element, a guide bar, and a carriage on the guide bar which is movable thereon, the carriage constituting a work-holder for holding an article to be ground, and to pro- Y vide arcuate guide bars which can be swung into or out of osition and upon which the guide bar is adjustable, so thatJ the inclination of the longitudinal axis of the article to be ground can be varied with respect to the face of the abrasive element. Y

A still further object of this invention is to provide a device which can be conveniently used either for sharpeningg'ravers or simllar articles or for forming facets upon precious stones, wherein the abrasive element is a rotary wheel. The improved construction when so used is advantageous in that the wear upon the abrasive stone is equally distributed thereover.

.With the foregoing and other objects in v1ew which will be made manifest in the following detailed description and specifically polnted out in the appended claims, reference is had to the accompanying drawings for an illustrative embodiment of' the invention, wherein: j Figure 1 is a perspective view of the device illustrated as being employed in sharpening a graver Fig. 2 is a similar view to Fig. 1 illustrating another manner in which a graver may be sharpened,

Fig. 3 is a top plan view of the constituting the work-holder,

Fig. 41 is a vertical section taken on the line 4L-4f of Fig. 3,

Fig. 5 is a view in end elevation of the Work-holder, j

Fig. 6 is a` vertical section taken on the line 6 6 of Fig. 4,

Fig. device as being used in forming a facet upon a precious stone, f

lig.' 8 is a front elevation of the same, an

Fig. 9 is a vertical section taken substantially on the line .9-9 of Fig. 8.

Referring to the accompanying drawings wherein similar reference characters designate similar parts throughout, the improved device consists of a supporting panel 10 on which blocks 11, 12 and 13 are mounted. The block 11 extends longitudinally of the panel and is arranged at the back thereof and at the back of a substantially circular aperture 14 formed in the panel. On the top surfaces of the blocks 12 and 13 there are mounted tubular supporting posts 15, the

carriage 7 is a top'plan view illustrating the I upper ends of which are open. A guide'bar guide bar 16 andwhich is rotatable thereon,

the guide bar being circular in Ycross section. This work-holder or-carriage consists ofan elongated block 20 through which the guide bar 16 slidably extends. On the top and bottom surfaces of the block 20 there are fastened small metallic cleats 21 providing ridgesor projections on the top and bottom surfaces of the block. These cleats are arranged parallel and extend transversely across the block and are different distances apart for a purpose hereinafter to be described.

An inverted U-shaped member 22 is provided, the top of which is arranged above the top of the block. The parallel arms of thefU-shaped member engage the ends of the block and extend downwardly therebelow. The sides of the arms of the U-shaped member are bent toward' each other as indicated at 28, and engage upon the sides of the block so that the U-shaped member will be maintained about the block although it is slidable relatively thereto. pertures 24 are formed in the parallel arms of the U'- shaped member 22 through which the upturned ends 25 of a bracket 26 extend. A bowed spring 27 also has its ends extending through the apertures 24, and resting upon the upturned ends 25 of the bracket. The' center of the spring 27 engages the bottom of the block 20 or the cleats on the under side thereof, and in this way the U-shaped member 22 would have its top drawn downwardly into clamping engagement against the top of the cleats on the top of the block, so that an article, such as the graver G, may be clamped thereagainst. Bails 28 or equivalent pivoted members are pivoted adjacent the corners of the U-shaped member 22 and are engageable upon the guide rod 16, so that the z:Ll-shaped member can be lifted thereby when the bails are pressed toward each other against the action of the spring 27 to facilitate the removal or insertion of the graver.

In Figs. 1 and 2 the abrasive element is shown as consisting of a whetstone W resting upon the supporting panel 10 against the block l1. When the graver is clam ed between the block and the U-shaped mem er andthe block is reciprocated upon the guide bar 16, the graver will be ground and sharpened upon the whetstone. Many diiferent types of gravers require that they be sharpened or ground to a line or edge which is exactly parallel to the central longitudinal axis of the graver. In order to accomplish this grinding the cleats are very advantageous. By selecting any two cleats the graver is inserted therebetween, one side of the graver being disposed toward the top of the block. As the graver will eng-age upon the two cleats it will be held thereby so that its slde will assume a certain inclination with respect to the top surface of the whetstone. When this side has been ground by reciproeating the carriage and holding the graver :temeer against the w-hetstone, the graver is then turned over between these two cleats and the other side will be caused to assume the same inclination with respect to the top surface of the whetone. In this way both sides of the graver will be sharpened and ground toward an edge which is perfectly parallel to the longitudinal axis of the tool. Various sized gravers may be ground by selecting diHeren-t pairs of cleats, which, because of their different distances apart, will accommodate these diferent sizes of gravers.

It is also desirable to vary the inclination of the longitudinal axis of the graver with respect to the top surface of the whetstone. To accomplish this there are provided four apertures 29 in the top of the block 11. Two arcuate guide bars30 are provided, each having one end rotatably mounted in the outermost apertures 29. In collapsed position the other ends of the arcuate guide bars 30 lit in the apertures adjacent the center of the block 1l. These guide bars, however, are capable of being swung .from the position shown in Fig. 1 to the position shown in Fig. 2, wherein their swinging ends may be caused to assume positions within the upper ends of the posts 15. In this position on loosening the set screws 19, the nuts 17 can be caused to slide upon the arcuate guide bars, and 'they can be held in adjusted position by tightening the set screws against `the arcuate guide bars 30. In this position it will be appreciated that the longitudinal axis of the graver has a much steeper inclination with respect to the whetstone lV than when in the position shown Iin Fig. 1. When the apparatus is so arranged, the carriage or work-holder can be reciprocated as before to grind or sharpen the graver.

The purpose o f having cleats upon both the top and bottom surfaces of the block is `to enable a greater variation of inclinations in which it is desired to hold the graver or the article. If those cleats on the topv of the block will not provide the desired adjustment, on removal of the bracket 26 and the spring 27, the inverted U-shaped member can be removed from the block and the block turned over and the U-shaped member againv lll() applied. In this way the cleats which are shown upon the drawing as being on the under side of the block can be'caused to assume the position on the top side of the block against which the graver can be clamped by the invertedU-shaped member.` f

The improved device can be very advantageously employed incutting .facets upon precious stones, as illustrated in Figs. 7 8 and 9. When so employed Ythe device is supported upon suitable supports 31 between which a horizontal. rotatable grindstone vS is rotatable. Such Igrindstone may be of any preferred construction and is illustrated as Iseing driven by a belt 32 from a motor 33. The grindstonev fits in the substantially circular aperture 14 formed in the panel 10. When so used the support or mount 34 which has the precious stone P mounted upon its end is clamped upon the work-holder or carriage, and the work-holder can be caused to slide back and forth alongl the guide bar 16. If the support or mount 34 is many sided, it

- can be caused to assume various positions by its engagement with the sides of the cleats and in this way the various facets upon the stone can be properly arranged and cut. By reciprocating the carriage or work-holder back and forth along the guide bar 16, the wear upon the top of the grindstone S will be equally distributed, which is quite advantageous in forming perfect facets. The inclination of the various facets can .be varied by swinging forwardly the arcuate guide bars 80 and-shifting the guide bar 16 up on to them, so as to vary the elevation of the guide bar 16 with respect to the top surface of the abrasive element.

From the above describedv construction it will be appreciated that an improved abrading device is provided having man advantages and which may be nicely emp oyed for sharpening gravers or similar implements or for grinding facets upon stones. The improved device serves to hold the article in such a lmanner that two different sides of the article may be held at the same inclination with respect to the top surface of the abrasive element. It further provides for an adjustment of the inclination of the longitudinal axis of the article with respect to the top surface of the abrasive element.

' It will be understood that various changes in the detail of construction may be made withoutdeparting from the spirit and scope olf the invention as defined by the appended c aims.

I claim:

1. A device of the class described comprising an abrasive element, a guide parallel thereto, a work-holder movable upon the guide, means for clamping an article to the work-holder, posts to which the guide means may be connected, means for connecting the guide means to the posts, and pivoted arcuate guide bars adapted to be connected to the posts, said means permitting said guide means to move over said arcuate guide bars as and for the purpose described.

2. A. device of the class described comprising a support, an abrasive element, a guide bar mounted upon said support, a workholder comprising a block through which the guide bar slidably extends, an inverted U-shaped member arranged over the block having its parallel arms engaging the ends of the block and portions engageable upon the sides of the block, and spring means urging said U-shaped member into clamping relation against the block.

3. A device of the class described comprising a support, an abrasive element, a guide bar mounted upon said support, a workholder comprising a block through which the guide bar slidably extends, anv inverted -U shaped member arranged over the block having its parallel arms engagingthe ends of the block and portions engageable upon the sides of the block, spring means urging said U-shaped member into clamping relation against the block, and pivoted members mounted upon the inverted U-shaped member engageable upon the guide bar to force the U-shaped member out of clamping engagement with the block against the action of said spring means.

In testimony whereof I have signed my name to this specification.

JOHN w. LEES. 

